Abstract: In a dielectric ceramic composed of a La.sub.2 O.sub.3 -CaO-TiO.sub.2 -MgO type or a BaO-Nd.sub.2 O.sub.3 -TiO.sub.2 type, the oxygen vacancy concentration of the ceramic is controlled below 7.times.10.sup.18 /cm.sup.3 by, for example, annealing the mixture after firing, or heat-treating the mixture after firing. The Q value of the dielectric ceramic can be markedly increased. In addition, ceramics having stable properties can be produced. Thus, the dielectric ceramics can fully cope with high frequencies and large electrification.

Abstract: The present invention provides ceramic compositions for preparing multi-layer capacitors (MLCs) having high dielectric constants between about 3000 and 4700 and stable temperature coefficients (TC) prepared from high purity barium titanate, niobium pentoxide, and cobalt oxide.

Abstract: A dielectric ceramic composition is disclosed which consists essentially of: a main ceramic composition containing barium oxide, titanium oxide, rare earth oxide and bismuth oxide as major components, which composition is represented by xBaO.yTiO.sub.2.z[(1-a)RE.sub.2 O.sub.3.aBi.sub.2 O.sub.3 ] where RE represents at least one rare earth metal, 0.10.ltoreq.x.ltoreq.0.20, 0.60.ltoreq.y.ltoreq.0.75, 0.10 .ltoreq.z.ltoreq.0.25, x+y+z=1 and 0<a .ltoreq.0.3; and a glass composition composed of ZnO, B.sub.2 O.sub.3 and SiO.sub.2, which is represented by k(wt. %)ZnO.m(wt. %)B.sub.2 O.sub.3 .n(wt. %)SiO2 where 30 .ltoreq.k.ltoreq.85, 5.ltoreq.m.ltoreq.50, 2.ltoreq.n.ltoreq.40, k+m+n=100. The glass composition is contained in an amount of at least 0.1 part by weight, but not more than (18-62.5a) parts by weight (where 0<a.ltoreq.0.2) or not more than 5.5 parts by weight (where 0.2<a.ltoreq.0.3), per 100 parts by weight of the main ceramic composition.

Abstract: An improved pyroelectric material comprises a polycrystalline material doped with at least one donor element such that the polycrystalline material has a grain size less than 10 .mu.m (or 5 .mu.m) and a Figure of Merit greater than 90 nC/(cm.sup.2.K). In the preferred embodiments the polycrystalline material is barium strontium titanate or calcium-substituted barium strontium titanate. The donor element may be Nb, Ta, Bi, Sb, Y, La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er or a combination thereof. The material may additionally be doped with an acceptor such as Co, Cu, Fe, Mn, Ru, Al, Ga, Mg, Sc, K, Na, U, In, Mg, Ni, Yb or a combination thereof to control the resistivity. Other structures and methods are also disclosed.

Abstract: A dielectric ceramic composition which comprises a composition represented by xBaO.yNd.sub.2 O.sub.3.zTiO.sub.2 (where 8.5.ltoreq.x.ltoreq.20, 5.ltoreq.y.ltoreq.23, 62.ltoreq.z.ltoreq.85, and x+y+z=100), Y.sub.2 O.sub.3 in an amount not more than 15 wt % of the amount of said composition, and Al.sub.2 O.sub.3 in an amount not more than 2 wt % of the total amount of the principal components BaO, Nd.sub.2 O.sub.3, TiO.sub.2, and Y.sub.2 O.sub.3. And a relative permittivity .epsilon.r of the dielectric ceramic is not less than 59, its dielectric loss (tan .delta.) is 3.times.10.sup.-4 .about.8.times.10.sup.-4 (2.7 GHz), and its temperature coefficient of resonant frequency .tau.f may be -30.about.+10 ppm/.degree.C. This microwave ceramic dielectric will be used for dielectric resonators in the microwave frequency region, microwave IC substrates, and impedance matching of microwave circuits.

Abstract: A nonreducible dielectric ceramic composition of a system, (A.sub.1-x R.sub.x).sub.y BO.sub.3, is produced using using at least one compound selected from the group consisting of water-soluble inorganic compounds and organic solvent-soluble organometallic compounds of rare earth element R together with oxides and/or carbonates of elements A and B.

Abstract: A system of dielectric ceramic compositions suitable for various microwave applications. The system comprises a plurality of stoichiometrically-related compositions, each composition having its own particular set of dielectric properties and consisting essentially of a sintered mixture represented by the general formula:BaTi.sub.4-w M.sub.w O.sub.9 --xZn.sub.2 TiO.sub.4 --yBaO--zTa.sub.2 O.sub.5wherein M is at least one type of metal and 0.0.ltoreq.w.ltoreq.about 0.05 and wherein x, y, and z are molar fractions of respective components with values within the following respective ranges: 0.0.ltoreq.x.ltoreq.about 0.45; about 0.01.ltoreq.y.ltoreq.about 0.20; and 0.0.ltoreq.z.ltoreq.about 0.10.

Abstract: A composition for forming a densified ceramic dielectric body, the composition consisting essentially of (a) about 96.0-98.0 wt. % barium titanate having an average particle size of 0.5-1.25 microns; (b) 0.3-1.2 wt. % niobium oxide or precursor thereof; (c) 0.4-1.2 wt. % zinc oxide or precursor thereof; (d) 0.1-1.2 wt. % neodymium oxide or precursor thereof; (e) 0.15-0.75 wt. % boron oxide or precursor thereof; and (f)0-0.1 wt. % manganese oxide or precursor thereof. This composition can be used to form the dielectric layers in multilayer electrical devices such as circuits and capacitors.

Abstract: A dielectric ceramic composition consists essentially of 100 mole parts of a major ingredient expressed by the formula,(Ba.sub.1-x Ca.sub.x)(Ti.sub.1-y Zr.sub.y)O.sub.3,where x is a numeral in the range of 0.01 to 0.10, and y is a numeral in the range of 0.10 to 0.24. To this major ingredient there are added from 0.10 to 2.0 mole parts of an erbium compound, and from 0.03 to 0.30 mole part of a manganese compound. Optionally, for the provision of low temperature sinterable ceramic compositions, there are also added from 0.03 to 0.40 mole part of a zinc compound and from 0.01 to 0.20 mole part of a silicon compound. Monolithic, solid dielectric capacitors are also disclosed which have ceramic bodies formulated from the above compositions.

Abstract: A method of producing a dielectric ceramic composition is disclosed which includes the steps of: preparing a main ceramic composition comprising BaO, TiO, and RE.sub.2 O.sub.3 (where RE represents at least one rare earth metal) as major components; calcining a mixture of starting materials which give the main ceramic composition, at a temperature of 1050.degree. C. or higher, to provide a calcined mixture; finely pulverizing the calcined mixture to provide a calcined ceramic powder having an average grain size of not larger than 0.8 .mu.m; and adding, as at least a part of a secondary component, a B.sub.2 O.sub.3 powder or a glass powder containing B.sub.2 O.sub.3, to the main ceramic composition. Also disclosed are a dielectric resonator and dielectric filter using such a dielectric ceramic composition as produced according to the above method, and a method of producing such a dielectric resonator or filter.

Abstract: A dielectric ceramic composition is disclosed which includes: a main ceramic composition of barium oxide and titanium oxide, or barium oxide, titanium oxide and at least one of strontium oxide, calcium oxide, zirconia and zinc oxide, which composition is represented by (1-a-b)BaO.aSrO.bCaO.x[(1-c)TiO.sub.2.cZrO.sub.2 ].yZnO, where 3.1.ltoreq.x.ltoreq.5.4, 0.ltoreq.y.ltoreq.2.9, 0.ltoreq.a+b.ltoreq.0.4, 0.ltoreq.c.ltoreq.0.2; and a secondary component at least a part of which consists of a B.sub.2 O.sub.3 material or a glass material containing as one of glass components, the secondary component being added to the main ceramic composition, in an amount of 0.1-7.5 parts by weight of B.sub.2 O.sub.3 per 100 parts by weight of the main ceramic composition.

Abstract: When the ratio of a dielectric ceramic composition is expressed as xPb(Mg.sub.1/3 Nb.sub.2/3)O.sub.3 --yPb(Zn.sub.1/3 Nb.sub.2/3)O.sub.3 --zPb(Sm.sub.1/2 Nb.sub.1/2) O.sub.3, the values x, y and z are set to lie inside the coordinates A, B, C, D, E (but excluding the segment AE) in a triangular diagram of FIG. 1, and wherein BaTiO.sub.3 is added thereto at a ratio of smaller 10 than 10 mol % and MnO.sub.2 is further added thereto at a ratio of from 0.01 to 0.6% by weight. There is obtained a dielectric ceramic which has a high dielectric constant, a low dissipation factor, a temperature more stable of dielectric constant, a good ceramic density and ceramic strength and that can be baked at a low temperature, and that are usable to MLCCS using Ag-Pd electrodes.

Abstract: Disclosed is a BaO-xTiO.sub.2 dielectric ceramic composition (x=3.5 to 4.5) containing BaTi.sub.4 O.sub.9 and Ba.sub.2 Ti.sub.9 O.sub.20, wherein the content ratio of Ba.sub.2 Ti.sub.9 O.sub.20 {Ba.sub.2 Ti.sub.9 O.sub.20 /(BaTi.sub.4 O.sub.9 +Ba.sub.2 Ti.sub.9 O.sub.20)}obtained by a X-ray diffraction maximum peak height integration method described below is less than 0.19,content ratio of Ba.sub.2 Ti.sub.9 O.sub.20 ={a peak height ascribed to the (421) face of Ba.sub.2 Ti.sub.9 O.sub.20 +a peak height ascribed to the (222) face thereof}/[{a peak height ascribed to the (200, 140) face of BaTi.sub.4 O.sub.9 +a peak height ascribed to the (121) face thereof+a peak height ascribed to the (230, 150) face thereof}+{a peak height ascribed to the (421) face of Ba.sub.2 Ti.sub.9 O.sub.20 +a peak height ascribed to the (222) face thereof}].In the above dielectric ceramic composition, it is possible to prevent the occurrence of hexagonal pattern cracks and hence to improve the yield.

Abstract: A nonreducing dielectric ceramic composition that includes BaTi0.sub.3 as a main component, the BaTi0.sub.3 containing alkali metal oxides in an amount more than 0.04 weight % as impurities. One or more of the following rare earth metal oxides (Re.sub.2 O.sub.3): Tb.sub.2 O.sub.3, Dy.sub.2 O.sub.3, Ho.sub.2 O.sub.3 and Er.sub.2 O.sub.3 ; and Co.sub.2 O.sub.3 in the following ratios: BaTiO.sub.3 is 92.0-00.4 mol %; Re.sub.2 O.sub.3 is 0.3-4.0 mol %; and Co.sub.2 O.sub.3 is 0.3-4.0 mol %; the composition also includes the following subcomponents: 0.2-4.0 mol % BaO; 0.2-3.0 mol % of MnO; and 0.5-5.0 mol % of MgO. The composition may include 0.5-2.5 weight parts of oxide glass containing BaO-SrO-Li.sub.2 O-SiO.sub.2 incorporated with 100 weight parts for the above composition. The composition may also include 0.5-4.0 mol % CaTiO.sub.3, 0.5-3.5 mol % CaZrO.sub.3 or one or both of NiO and Al.sub.2 O.sub.3 in an amount 0.3-3.0 mol %. Further, 0.5-2.5 weight parts of oxide glass containing BaO-SrO-Li.sub.2 O-SiO.sub.

Abstract: The present invention is directed to non-reducible dielectric composition consisting essentially of a main composition composed of a modified barium titanate system and additives (A) and (B) incorporated therein, said main composition consisting essentially of oxides of Ba, Ca, Ti, Zr, and Nb and having a composition represented by general formula:{(Ba.sub.1-x Ca.sub.x)O}.sub.m (Ti.sub.1-o-p Zr.sub.o Nb.sub.p)O.sub.2+p/2'wherein x, o, p and m satisfy the relationships of, ##EQU1## said additive (A) being composed at least one oxides selected from the group consisting of oxides of Mn, Fe, Cr, Co, and Ni, said additive (A) being incorporated into said main composition in an amount of 0.02 to 2.0 moles per 100 moles of said main composition in terms of respective oxides, MnO.sub.2, FeO.sub.3, Cr.sub.2 O.sub.3, CoO, and NiO, said additive (B) consisting of SiO.sub.2 and/or ZnO and incorporated into said main composition in an amount of 0.1 to 2.0 moles per 100 moles of said main composition.

Abstract: Ceramic composition comprising oxides of the elements Ba, Ti, Zn, and Me where Me is Nb or Nb and Ta, the mole ratios of the elements relative to Ba being:3.8.ltoreq.Ti.ltoreq.4.50.1.ltoreq.Zn.ltoreq.1.00.05.ltoreq.Me.ltoreq.0.3and the composition containing at least one crystal structure of BaTi.sub.4 O.sub.9 and BaTi.sub.9 O.sub.20. The ceramic compositions have an excellent combination of electrical characteristics including Q value at the frequencies of interest for dielectric resonators, the dielectric constant and the T.sub.f value and are well adapted for use as electrical components in equipment operating at microwave frequencies such cellular communications equipment.

Abstract: Disc and monolithic (multilayer) ceramic capacitors having a fine grained barium titanate body exhibit a high dielectric constant and a smooth (X7R) temperature coefficient of capacitance. The start ceramic materials for making such capacitors are predominantly spherical barium titanate powder particles of average particle size less than 0.7 micron and of narrow particle size distribution. The barium titanate is mixed with around 2 weight percent of a the cadmium silicate flux, 3Cd.SiO.sub.2, serving as a reactivity and sintering promoting agent; and about one weight percent of a reactivity and sintering inhibitor agent, Nb.sub.2 O.sub.5. After preparing a green body of this mixture, the body is sintered at about 1100.degree. C.

Abstract: A dielectric ceramic composition represented by the compositional formula: .sub.x BaO-.sub.y TiO.sub.2 -.sub.z Nd.sub.2 O.sub.3 -.sub.t Sm.sub.2 O.sub.3 -.sub.w Bi.sub.2 O.sub.3 so composed as to be in the molar fractions of 0.06.ltoreq.x.ltoreq.0.25, 0.60.ltoreq.y.ltoreq.0.80, 0.05.ltoreq.z.ltoreq.0.18, 0<t.ltoreq.0.07 and 0<w.ltoreq.0.05, provided that x+y+z+t+w=1, and a compositional range of Y<0.68 and Z>0.15 is excluded. As an additive, at least one of Al.sub.2 O.sub.3, ZrO.sub.2, etc. may be added. Part of Ba may be replaced with at least one of Sr, Ca and Mg. The Sm.sub.2 O.sub.3 and Nd.sub.2 O.sub.3 each may have a purity of at least 70 wt. %.

Abstract: A high dielectric ceramic composition essentially consisting of 97.04 weight % to 97.80 weight % of BaTiO.sub.3 as a host material, 1.42 weight % to 1.92 weight % of Nb.sub.2 O.sub.5, 0.04 weight % to 0.06 weight % of MnO.sub.2 0.33 weight % to 0.45 weight % of CoO, 0.31 weight % to 0.41 weight % of CeO.sub.2 and 0.10 weight % to 0.12 weight % of ZnO. The composition exhibits TCC characteristic satisfying the characteristic of X7R of EIA standard, high dielectric constant of 3,200 to 3,800 and high insulation resistivity of 10.sup.3 to 10.sup.14. With these characteristics, the composition is useful for making multi-layer ceramic capacitors, thereby contributing to a compactness of electronic/electric appliances.

Abstract: A non-reducible dielectric ceramic composition comprises of a basic composition expressed by the general formula:{(Ba.sub.1-x-y Sr.sub.x Ca.sub.y)O}.sub.m (Ti.sub.1-o-p Zr.sub.o Nb.sub.p)O.sub.2+p/2wherein 0.05.ltoreq.x 0.30, 0.005.ltoreq.y.ltoreq.0.12, 0.ltoreq.o.ltoreq.0.20, 0.0005.ltoreq.p.ltoreq.0.012, and 1.002.ltoreq.m.ltoreq.1.03, or{(Ba.sub.1-x-y-z Sr.sub.x Ca.sub.y Mg.sub.z)O}.sub.m (Ti.sub.1-o-p Zr.sub.o Nb.sub.p)O.sub.2+p/2wherein 0.05.ltoreq.x.ltoreq.0.35, 0.005.ltoreq.y 0.12, 0.0005 .ltoreq.z.ltoreq.0.05, 0<o.ltoreq.0.20, 0.0005.ltoreq.p.ltoreq.0.02, 1.000.ltoreq.m.ltoreq.1.04. The composition contains an additive (A) composed of one or more oxides selected from the group of MnO.sub.2, Fe.sub.2 O.sub.3, Cr.sub.2 O.sub.3, CoO and NiO in an amount of 0.02 to 2.0 moles per 100 moles of the basic composition. The composition further contains an additive (B) consisting of SiO.sub.2 and/or ZnO in an amount of 0.1 to 2.

Abstract: A composition consisting essentially of 60.0-70.0 mol % TiO.sub.2, 14.3-20.0 mol % Nd.sub.2 O.sub.3, 11.0-16.7 mol % BaO, 1.0-8.0 mol % ZrO.sub.2 and 0.05-0.30 mol % CeO.sub.2. This composition is useful for forming densified ceramic dielectric bodies having a dielectric constant of at least 65 and which meet COG specifications, and multilayer capacitors that contain such dielectric bodies.

Abstract: Disclosed herein is a ceramic composition which gives a microwave dielectric having a permittivity and unloaded Q in a practical range and a small temperature coefficient (.tau.f) in the neighborhood of zero of resonance frequency owing to the controlled amount of ZnO and Ta.sub.2 O.sub.5 added. The .tau.f value may be positive or negative in the neighborhood of zero according to need. The ceramic composition comprises a principal component represented by (BaO-3.7TiO.sub.2).xZnO, where x is in the range of 15.ltoreq.x.ltoreq.17 wt % and a secondary component containing 2-6 wt % Ta.sub.2 O.sub.5 and not more than 1 wt % MnO.sub.2 based on the amount of the principal component. The ceramic composition may also contain BaO-3.8TiO.sub.2, 12-16 wt % ZnO, and 2-6 wt % Ta.sub.2 O.sub.5, or contain BaO-3.6TiO.sub.2, 17-19 wt % ZnO, and 2-6 wt % Ta.sub.2 O.sub.5.

Abstract: A nonreducible dielectric ceramic composition of a system, (A.sub.1-x R.sub.x).sub.y BO.sub.3, is prepared by preparing a slurry containing at least one compound selected from the group consisting of carbonates and hydroxides of Ba, Sr, Ca and Mg, at least one compound selected from the group consisting of carbonates and hydroxides of rare earth elements R, and at least one compound selected from the group consisting of oxides, carbonates and hydroxides of Ti, Zr and Sn; filtering the resulting slurry; washing the filter cake with water and calcining the resulting washed cake.

Abstract: There is provided structure and a manufacturing method of a multilayer ceramic capacitor which realizes a low rate of change in electrostatic capacity, a small size, high capacity and low manufacturing cost. A plurality of ceramic sheets (S1 to S10) having different Curie points are applied by carbonaceous ink (2) and laminated. By subjecting to sintering, the carbonaceous ink (2) is incinerated with the result that a plurality of empty layers (4) are formed. Thereafter, lead or the like is poured into empty layers (4) so as to form a plurality of internal electrodes (41 and 42). Due to a multilayer structure made up of a plurality of ceramic sheets having different Curie points, a low rate of change in electrostatic capacity is realized on the basis of the logarithmic mixing law. Further, in the sintering step, intervening empty layers (4) between every adjoining ceramic sheets prevent the diffusion of ceramic materials.

Abstract: A dielectric ceramic composition of matter characterized in that the composition of matter contains 0.003 to 0.3% by weight manganese in addition to the main composition of matter represented by the composition formula xBaO.multidot.yNd.sub.2 O.sub.3 .multidot.zTiO.sub.2 .multidot.wBi.sub.2 O.sub.3 wherein 0.110.ltoreq.x.ltoreq.0.170, 0.120.ltoreq.y.ltoreq.0.185, 0.630.ltoreq.z.ltoreq. 0.710, 0.020.ltoreq.w.ltoreq.0.090, and x+y+z+w=1. This composition of matter is high in dielectric constant, low in the temperature dependency of resonance frequency in a resonator, and high in Q-value.

Abstract: To produce a modified barium titanate ceramic which is semiconductive and sufficiently high in breakdown voltage and has a low specific resistance at room temperature and a high positive temperature coefficient (PTC) of resistance, the invention provides a powder composition comprising (A) a basic mixture consisting of 45-85 mol % of BaTiO.sub.3 powder, 1-20 mol % of SrTiO.sub.3 powder, 5-20 mol % of CaTiO.sub.3 powder and 1-20 mol % of PbTiO.sub.3 powder, (B) a source of a dopant element such as Nb, Sb, Y, La or Ce to render the ceramic semiconductive, (C) a source of Mn such as MnC.sub.2 O.sub.4 and/or a source of Cu such as CuO added such that the total amount of Mn and Cu is not more than 0.06 mol % on the basis of the quantity of the mixture (A) with proviso that the amount of Mn is not more than 0.025 mol % and (D) SiO.sub.2 amounting to 0.1-2.0 mol % on the basis of the quantity of the mixture (A). The BaTiO.sub.3 powder and the SrTiO.sub.3 powder are produced by calcining BaTiO(C.sub.2 O.sub.4).sub.

Abstract: A dielectric ceramic composition containing 0.3 to 5.0 parts by weight of an additive composed of at least one of SiO.sub.2, Li.sub.2 O and B.sub.2 O.sub.3 per 100 parts by weight of a main component expressed by the following composition formula:(1-x-y-z-t)BaTiO.sub.3 +xCaZrO.sub.3 +yMgO+zMnO+tRe.sub.2 O.sub.3,wherex.ltoreq.0.060.005.ltoreq.y.ltoreq.0.080.005.ltoreq.z.ltoreq.0.020.005.ltoreq.t.ltoreq.0.02.In the composition formula, Re indicates at least one of Y, Gd, Dy, Ho, Er and Yb.

Abstract: Disclosed herein is a microwave dielectric ceramic composition which comprises a compound represented by the formula BaO.multidot.xTiO.sub.2 (where 3.7.ltoreq.x.ltoreq.4.5) which is incorporated with 1.0-10 wt. % Ba.sub.3 Ti.sub.12 Zn.sub.7 O.sub.34 and 2-8 wt. % Ta.sub.2 O.sub.5. It has well-balanced performance owing to a Q value not less than 8000 (at 4.5 GHz), a relative permittivity .epsilon. not less than 31, and a practical temperature coefficient in the range of -15 to +10 ppm/.degree.C. It may be further incorporated with 0.1-0.4 wt. % MnO.sub.2 for improved sinterability in addition to the above-mentioned performance.

Abstract: A piezoelectric composite material prepared by compounding a ferroelectric ceramic powder comprising microcrystals having virtually single domains and a polymer. This composite has both the high piezoelectric property of the ferroelectric ceramic and the pliability of the polymer.

Abstract: A composition comprising finely divided particles of modified barium titanate; and an admixture of calcium, titanium and manganese; the modified barium titanate particles containing Zr, Zn and Nb homogeneously distributed on an atomic scale throughout the particles according to the formula:BaTi.sub.1-(x+3y/2) (Zr.sub.x Zn.sub.y/2 Nb.sub.y) O.sub.3wherein x=0.01-0.20 and y=0.005-0.075. This composition forms a dielectric layer having a Curie Temperature below 25.degree. C., a dielectric constant of at least 10,000 and grain size of 5 microns or less and is useful in multilayer electrical devices such as circuits and capacitors.

Abstract: The dielectric ceramic composite according to the invention contains at least one kind of lanthanum oxide, cerium oxide, neodymium oxide, praseodymium oxide and samarium oxide at an amount of 2.5-5.0 mol % and zirconium oxide, tin oxide and titanium oxide at an amount of 0.5-8.5 mol% in a formula (Zr.sub.1-a-b Sn.sub.a Ti.sub.b) O.sub.3 (where a>0, b.gtoreq.0, 0<a+b.ltoreq.1.0) to barium titanate of 100 mol % containing alkali metal oxide less than 0.03% by weight as an impurity. Barium zirconate and barium stannate at an amount of 0.5-5.0 mol % in a formula Ba (Zr.sub.1-a Sn.sub.a) O.sub.3 (where 0<a.ltoreq.1.0) and titanium oxide at an amount of 1.5-6.0 mol % may be added instead of zirconium oxide, tin oxide, titanium oxide.

Abstract: The present invention provides microwave ceramic dielectric materials having large relative dielectric constant, very large Q, and stable and small temperature coefficient.The ceramic dielectric materials of the present invention are expressed by the general formula:[{BaO}.sub.x {TiO.sub.2 }.sub.y {(Sm.sub.2 O.sub.3).sub.1-m-n (SrO.cndot.CeO.sub.2).sub.m (CaO.cndot.CeO.sub.2).sub.n }.sub.z ].sub.1-A [SrTiO.sub.3 ].sub.Awherein, 0.1.ltoreq.x.ltoreq.0.25, 0.6.ltoreq.y.ltoreq.0.85, 0.05.ltoreq.z.ltoreq.0.3, 0.ltoreq.m.ltoreq.0.80, 0.ltoreq.n<0.8, x+y+z=1, m+n.ltoreq.0.8, x+y+z=1, 0<A.ltoreq.0.40; x,y,z are expressed by mol fraction.

Abstract: A barium titanate based dielectric ceramic composition having a temperature coefficient range of about +/-15% form its value at 25.degree. C. over a temperature range of -55.degree. C. to 125.degree. C., and a dielectric constant in excess of 5000, is prepared from a ternary system comprising barium titanate, nickel niobate and manganese niobate in the molar ratios of approximately 97.23 mole % of BaTiO.sub.3, 2.35 mole % of NiO.sub.(1-x).NbO.sub.2.5(x), and 0.42 mole % of MnO.sub.1-y).NbO.sub.2.5(y), where x may equal approximately 0.73 and y approximately 0.53. Tantalum is also used in place of the niobium.

Abstract: A composition consisting essentially of 60.0-70.0 mol % TiO.sub.2, 14.3-20.0 mol % Nd.sub.2 O.sub.3, 11.0-16.7 mol % BaO, 1.0-8.0 mol % ZrO.sub.2 and 0.05-0.30 mol % CeO.sub.2. This composition is useful for forming densified ceramic dielectric bodies having a dielectric constant of at least 65 and which meet COG specifications, and multilayer capacitors that contain such dielectric bodies.

Abstract: A low firing dielectric composition containing an admixture of finely divided particles of manganese doped-lead iron-tungsten niobate, barium titanate and optionally an inorganic sintering aid, dispersed in an organic medium. This composition is useful for forming capacitors.

Abstract: A monolithic capacitor having a dielectric ceramic body cosintered with at least two base metal electrodes. The ceramic body is composed of a major ingredient expressed by the formula,(1--.alpha.) {(Ba.sub.k-x-z M.sub.x L.sub.z)O.sub.k (Ti.sub.1-y R.sub.y)O.sub.2-(y/2) }+.alpha.CaZrO.sub.3where M is either or both of magnesium and zinc, L is either or both of calcium and magnesium, R is a rare earth element or elements, and .alpha., k, x, z and y are numerals in specified ranges. To this major ingredient is added a minor proportion of a first additive ingredient and a second additive ingredient. The first additive ingredient is at least either of chromium oxide and aluminum oxide. The second additive ingredient is a mixture of boric oxide or lithium oxide, silicon dioxide and at least one metal oxide selected from among barium oxide, strontium oxide, calcium oxide, magnesium oxide and zinc oxide.

Abstract: A process for producing a high density ceramic of perovskite represented by the formula:ABO.sub.

Abstract: Dielectric ceramic composition consisting essentially of substance selected from those represented by the following formula:Pb.sub.1-x+a Me.sub.x {(Zn.sub.1/3 Nb.sub.2/3)1.sub.-y-z Ti.sub.y (Cu.sub.b M.sub.1-b).sub.2 }O.sub.3+awherein Me is at least one element selected from Sr and Ba; M is at least one element selected from Nb, Ta and W; x and y are within the scope shown in FIGS. 1, 3 or 2; and O.ltoreq.a.ltoreq.0.1, 0.02.ltoreq.b.ltoreq.1.0, 0.002.ltoreq.bz.ltoreq.0.04.Multi-layer capacitors having dielectric layers made of the dielectric ceramic composition exhibit a good temperature coefficient of capacitance.

Abstract: A monolithic capacitor having a dielectric ceramic body cosintered with at least two base metal electrodes. The ceramic body is composed of a major ingredient expressed by the formula,(1-.alpha.){(Ba.sub.k-x M.sub.x)O.sub.k (Ti.sub.1-y R.sub.y)O.sub.2-(y/2) }+.alpha.CaZrO.sub.3where M is either or both of magnesium and zinc, R is a rare earth element or elements, and .alpha., k, x and y are numerals in specified ranges. To this major ingredient is added a minor proportion of an additive. The additive is a mixture of boric oxide or lithium oxide, silicon dioxide and at least one metal oxide selected from among barium oxide, strontium oxide, calcium oxide, magnesium oxide and zinc oxide. For the fabrication of capacitors the mixture of the above major ingredient and additives in finely divided form are formed into moldings of desired shape and size, each with at least two electrodes buried therein.

Abstract: A monolithic capacitor having a dielectric ceramic body cosintered with at least two base metal electrodes. The ceramic body is composed of a major ingredient expressed by the formula(1-.alpha.){(Ba.sub.k-x M.sub.x)O.sub.k (Ti.sub.1-y R.sub.y)O.sub.2-(y/2) }+.alpha.CaZrO.sub.3where M is either or both of calcium and strontium, R is a rare earth element or elements, and .alpha., k, x and y are numerals in specified ranges. To this major ingredient is added a minor proportion of a first additive ingredient and a second additive ingredient. The first additive ingredient is at least either of chromium oxide and aluminum oxide. The second additive ingredient is a mixture of boric oxide or lithium oxide, silicon dioxide and at least one metal oxide selected from among barium oxide, strontium oxide, calcium oxide, magnesium oxide and zinc oxide.

Abstract: A dielectric ceramic powder composition for forming multilayer ceramic devices having thin dielectric layers with low porosity and having a dissipation factor which meets or exceeds X7R specifications, and consisting essentially of an admixture of a major component ceramic powder particle and minor component additives the amounts of which are controlled within certain predetermined ratios.

Abstract: A composition for producing ceramic dielectrics which comprises: a mixture of barium titanate which has average particle size of 0.1-1.5 .mu.m is amounts of 98-60 mole % and a perovskite type barium titanate solid solution which has average particle size of 0.1-1.5 .mu.m and a Curie temperature of 50.degree.-115.degree. C. in amounts of 2-40 mole %; and(A) at least one of niobium oxides and tantalum oxides in amounts of 0.3-2 moles % in relation to 100 mole % of the mixture; and(B) at least one of cobalt oxides, nickel oxides, magnesium oxides, manganese oxides, copper oxides and oxides of a rare earth metal in amounts of 0.1-2 moles % in relation to 100 mole % of the mixture.The composition provides a ceramic dielectric which has a large relative permittivity and still has a small temperature dependence of relative permittivity within .+-.15% over a temperature range between -55.degree. C. and +125.degree. C. taking a relative permittivity at 20.degree. C. as a standard.

Abstract: An improved ceramic dielectric composition comprising a chemically homogeneous distribution of a mixture of additives on the surface of particles of ceramic powder, and to a method for enhancing the dielectric properties and sinterability of such compositions at low firing temperatures.

Abstract: A monolithic capacitor having a dielectric ceramic body cosintered with at least two base metal electrodes. The ceramic body is composed of a major ingredient expressed by the formula,(1-.alpha.){(Ba.sub.k-x-z M.sub.x L.sub.z)O.sub.k (Ti.sub.1-y R.sub.y)O.sub.2-(y/2) }+.alpha.CaZrO.sub.3where M is either or both of magnesium and zinc, L is either or both of calcium and magnesium, R is a rare earth element or elements, and .alpha., k, x, z and y are numerals in specified ranges. To this major ingredient is added a minor proportion of an additive ingredient. The additive ingredient is a mixture of boric oxide or lithium oxide, silicon dioxide and at least one metal oxide selected from among barium oxide, strontium oxide, calcium oxide, magnesium oxide and zinc oxide. For the fabrication of capacitors the mixture of the above major ingredient and additives in finely divided form are formed into moldings of desired shape and size, each with at least two electrodes buried therein.

Abstract: A dielectric ceramic for microwave applications is comprised of:X BaO.Y TiO.sub.2.Z {(Sm.sub.2 O.sub.3).sub.1-W1-W2 (La.sub.2 O.sub.3).sub.W1 (Nd.sub.2 O.sub.3).sub.W2 }where X, Y, Z lie in the ranges: 11.0.ltoreq.X.ltoreq.22.0; 60.0.ltoreq.Y.ltoreq.75.0; and 6.0.ltoreq.Z.ltoreq.28.0 (X+Y+Z=100) expressed in mole %, and 0<W.sub.1 .ltoreq.0.35; 0<W.sub.2 <1; and 0<(1-W.sub.1 -W.sub.2)<1; where W.sub.1, W.sub.2 and (1-W.sub.1 -W.sub.2) are mole ratios. MnO.sub.2 or Al.sub.2 O.sub.3 may also be added.Alternatively, a dielectric ceramic may comprise:X BaO.Y TiO.sub.2.Z {(Sm.sub.2 O.sub.3).sub.1-W1-W2 (La.sub.2 O.sub.3).sub.W1 (Nd.sub.2 O.sub.3).sub.W2 }.V Bi.sub.2 O.sub.3where X, Y, Z and V lie in the ranges: 11.5.ltoreq.X.ltoreq.21.0; 60.0.ltoreq.Y.ltoreq.76.0; 6.5.ltoreq.Z.ltoreq.26.0; and 0.1.ltoreq.V.ltoreq.5.0 (X+Y+Z+V=100), expressed in mole %, and 0<W.sub.1 <1; 0<W.sub.2 <1; 0.ltoreq.(1-W.sub.1 -W.sub.2)<1, where W.sub.1, W.sub.2 and (1-W.sub.1 -W.sub.2) are mole ratios. MnO.

Abstract: A monolithic capacitor having a dielectric ceramic body cosintered with at least two base metal electrodes. The ceramic body is composed of a major ingredient expressed by the formula,(1-.alpha.) {(Ba.sub.k-x M.sub.x)O.sub.k (Ti.sub.1-y R.sub.y)O.sub.2-(y/2) }+.alpha.CaZrO.sub.3where M is either or both of calcium and strontium, R is a rare earth element or elements, and .alpha., k, x and y are numerals in specified ranges. To this major ingredient is added a minor proportion of an additive. The additive is a mixture of boric oxide or lithium oxide, silicon dioxide and at least one metal oxide selected from among barium oxide, strontium oxide, calcium oxide, magnesium oxide and zinc oxide. For the fabrication of capacitors the mixture of the above major ingredient and additives in finely divided form are formed into moldings of desired shape and size, each with at least two electrodes buried therein.

Abstract: A high-dielectric constant ceramic composite is provided in which an appropriate amount of glass component is added to a composite of the BaTiO.sub.3 -PbMO.sub.3 group having a low temperature coefficient in the dielectric constant thereof. The added glass component serves to maintain the satisfactory properties of the ceramic composite even after various types of reliability tests.

Abstract: The ceramic sinter is composed of a metal oxide such as ZrO.sub.2 and 10-90 vol. % of metal fluoride which is selected from the group having not less than 2.5 electronegativity difference between fluoride and the metal element.The ceramic sinter has a thermal expansion coefficient of 15-20.times.10.sup.-6 /.degree.C. and is suitable for bonding with general use metals such as stainless steel to form a composite body of the ceramic sinter and the metal without causing a substantial thermal stress at the juncture thereof.

Abstract: The invention relates to a ceramic composition.It comprises at least one phase of a structure derived from that of tungsten tetragonal bronze and at least one phase of a structure derived from Perovskite.Application to the electrical and electronics industry.

Abstract: The invention relates to new ceramic electrostrictive compositions having superior electrical properties, a process for the preparation of the new electrostrictive compositions and applications for the new compositions. Specifically, a solid solution composition of lead magnesium niobate-lead titanate - (barium titanate or stronium titanate) has exhibited desirable electrostrictive properties. This composition shows a diminished dependence of dielectric constant on temperature.